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research design to study sampl design Literacy

Research designs in college statistics

Given that the description of the case below, identify whether you would use  a randomized block design, a completely randomized design or a matched pairs design.

Sample Design Literacy In “Cardiovascular Effects of Intravenous Triiodothyronine in Patients Undergoing Coronary Artery Bypass Graft Surgery” ( Journal of the American Medical  Association, Vol. 275, No. 9), the authors explain that patients were assigned to one of three groups: (1) a group treated with triidothyronine, (2) a group treated with normal saline bolus and dopamine, and (3) a placebo group given normal saline. The authors summarize the sample design as a “prospective, randomized, double-blind, placebo-controlled trial.” Describe  the meaning of each of those terms in the context of this study